JPH03253370A - Printer device - Google Patents

Abstract

PURPOSE:To change an engaging position relation and to reduce one-sided wear of each gear by providing a clutch mechanism which changes combination of engagement between gears with which a reduction drive transmission mechanism is formed and switches between a state wherein a reduction gear ratio is an integral number and a state wherein at least one of reduction gear ratios is not an integral number. CONSTITUTION:A clutch mechanism comprises a rim 25 and levers 26 and 27, and the lever 26 is rotated around a fulcrum axle 26b. An intermediate gear 24 and a platen gear 21 are changed into a state wherein the gears are not engaged with each other and a state wherein they are engaged with each other. The modules of a drive gear 20, intermediate gears 23 and 24, and platen gears 21 and 22 are all equal to each other, and a reduction drive transmission mechanism is formed therewith. Provided the drive gear 20 is 22, the intermediate gear 23 is 88, the intermediate gear 24 is 59, the platen gear 21 is 118, and the platen gear 22 is 89 in the number of teeth, a reduction gear ratio between the drive gear 20 and the intermediate gear 23 is 4, and a reduction gear ratio between the intermediate gear 24 and the platen gear 21 is 2 being an integral number. Meanwhile, a reduction gear ratio between the in termediate gear 23 and the platen gear 22 is 89/88 being not an integral number.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a printer device that records characters and images on recording paper.

[Prior Art] FIG. 6 is a block diagram showing a conventional printer device (for example, Japanese Patent Application No. 61-173597).

In the figure, (1) is recording paper, (2) is clamp, (3
) is a cylindrical platen roller having an outer circumference slightly longer than the length of the recording paper (1), and the platen shaft (3
The recording paper (1), the leading end of which is fixed by the clamp (2), is wound around a) as the center of rotation. (4) is an ink sheet, on the surface facing the recording paper (1), sublimation ink is applied sequentially in yellow and magenta cyan for each screen recording area, and (4a) is the ink sheet ( With the ink sheet supply reel around which the ink sheet (4) is wound, always apply appropriate pack tension to the ink sheet (4) as it travels in the direction of the arrow a.
b) is an ink sheet take-up reel that rotates to take up the ink sheet (4). (5) is a line-type thermal head in which heating elements (5a) are arranged in a line in the width direction of the recording paper (1), and (6) and (7) are line-type thermal heads that are arranged in a line in the width direction of the recording paper (1). A guide roller that guides the thermal head (5) and the same support (
(not shown). (8) is a motor,
It is a driving means for rotating the platen roller (3), which has a motor shirt i (8a) on its rotating shaft, and (
9) is a gear shaft. (lO) is a driving gear fixed to the motor shaft (8a), (11) is a platen gear fixed to the platen shaft (3a), and (12) is centered about the gear shaft (9). The intermediate gear (13) is rotatably supported as a gear shaft (9) and always meshes with the drive gear (lO).
), and is always in mesh with the platen gear (11), and the intermediate gears (12) and (13) rotate integrally. The drive gear (lO), the intermediate gears (12) and (13)
The modules of the platen gear (11) are all the same, and these four gears constitute a deceleration drive transmission mechanism. The number of teeth is, for example, 22 for the drive gear (10), 88 for the intermediate gear (12), and 5 for the intermediate gear (13).
9 pieces, and the platen gear (11) has 118 pieces. Here, if the reduction ratio is the number of rotations of the driving gear required to rotate the driven gear once, then the reduction ratio of the driving gear (lO) and the intermediate gear (12) is 4. The reduction ratio between the intermediate gear (13) and the platen gear (11) is 2, and the final reduction ratio of this reduction drive transmission mechanism is 8.

The operation of the conventional printer device configured as described above will be explained using FIGS. 7 to 9.

First, the paper feeding state is shown in Fig. 7, and the thermal head (5
) and guide rollers (6) and (7) are spaced apart from the platen roller (3), and when the clamp (2) is in the position shown in FIG. 7 on the platen roller (3), the recording paper (1) is The recording paper (1) is conveyed in the direction of arrow C, and the clamp (2) moves in the direction of arrow C to clamp the leading edge of the recording paper (1).

Subsequently, the rotational force of the motor (8) is transmitted to the platen gear (11) via the drive gear (lO) and intermediate gears (12> and (13)), and as a result, the platen roller (3)
rotates in the direction of arrow d, and when the leading edge of the recording paper (1) reaches a predetermined recording start position near the thermal head (5),
The motor (8) stops rotating, and the platen roller (3) temporarily stops rotating.

At this time, the recording start portion of the first color yellow ink has come to the position facing the heating element (5a) of the ink sheet (4), and the thermal head (5) and guide rollers (6) and (7) ) moves in the direction of arrow e, and the heating element (5a) touches the ink sheet (4) and the recording paper (1).
) is pressed against the platen roller (3). This state is shown in FIG. 8 as a recording start state.

Next, the platen roller (3) rotates in the direction of arrow f, and the recording paper (1) and ink sheet (4) are conveyed in the direction of arrow f while being in close contact with each other, and at the same time, the thermal head (5)
) is transmitted in synchronization with the transport speed of the recording paper (1), and the heating elements (5a) are sequentially and selectively heated to transfer the yellow ink onto the recording paper (1) to produce a yellow image. Record images. At this time, as the ink sheet (4) travels in the direction of the arrow g, the sheet supply reel (4a) rotates in the direction of the arrow while applying appropriate pack tension, and the sheet take-up reel (4b) rotates the ink sheet ( 4
) while winding it up in the direction of arrow i. When the recording of the yellow image is completed through the above operations, the rotation of the platen roller (3) is temporarily stopped, the thermal head (5) and guide rollers (6) and (7) move in the direction of arrow j, and the platen roller ( 3) Stay away from. This state is shown in FIG. 9 as a recording end state.

After this, the platen roller (3) rotates in the direction of the arrow,
When the leading edge of the recording paper (1) again reaches the same position at which the yellow image recording started, the rotation of the platen roller (3) is temporarily stopped. During this time, the ink sheet l-, (4) is transported by the sheet take-up reel (4b) in one direction of the arrow 1 for a certain period of time, and the recording start portion of the second color magenta ink is placed at a position facing the heating element (5a). When this happens, the sheet take-up reel (4b) stops rotating.

After the above operations in FIG. 9 are completed, the thermal head (5) and guide rollers (6) and (7) move in the direction of the arrow m, and the heating element (5a) moves between the ink sheet (4) and the recording paper. (1) through the platen roller (3)
) is pressed against. Then, the platen roller (3) rotates and records a magenta image over the already recorded yellow image. When the recording of the magenta image is completed, a cyan image is similarly recorded in an overlapping manner to complete color recording.

Here, if there is pitch unevenness or eccentricity of the pitch circle in at least one of the drive gear (lO), intermediate gears (12) and (13), and platen gear (11), even if the motor ( Even if the rotation accuracy of 8) is good, rotational unevenness occurs in the rotation of the platen roller (3), and pitch unevenness occurs in the image recorded on the recording paper (1). However, with this gear configuration, while the platen gear (11) makes one rotation, the intermediate gear (13) and (1
2) rotates twice, and the drive gear (lO〉) rotates eight times. Therefore, the rotational irregularities of the platen roller (3) caused by pitch irregularities of each gear or eccentricity of the pitch circle, etc. Since it appears periodically every rotation, for example, the relative meshing positional relationship between gears during recording of a yellow image is also reproduced during recording of magenta and cyan images. The pitch unevenness of the image becomes the same for each color, and color shift is reduced.

[Problems to be Solved by the Invention] Generally, in order to perform high-quality color recording, it is necessary to transfer a plurality of dyes in an overlapping manner to the same area, and the accuracy of this overlapping greatly influences the image quality. When a relative positional shift occurs between images of each color after transfer, so-called color shift occurs, which is accompanied by unnatural color outlines and also reduces resolution.

However, in such a printer device, if the speed reduction ratio between the gears constituting the deceleration drive transmission mechanism that reduces the rotational speed of the driving means and transmits it to the platen roller is arbitrarily set, the rotation speed of the drive means is reduced and the speed reduction drive is transmitted to the platen roller. The relative meshing positional relationship between the respective gears at any point during one rotation of the color may be different from the meshing positional relationship during recording of other colors. In this case, the influence of the unique rotational unevenness characteristics of each gear on the rotational unevenness of the platen roller differs for each color, resulting in color misregistration.

For this reason, as in the conventional example, all the reduction ratios between the gears constituting the reduction drive transmission mechanism are set to integers, and one of the platen rollers is
By making the relative meshing positional relationship between each gear the same at any point during rotation for each color, the rotational unevenness of the platen roller caused by the unique rotational unevenness characteristics of each gear is made the same for each color, thereby eliminating color misalignment. A method is used to reduce the

However, by making the relative meshing positional relationship between each gear the same, the teeth of each gear and the gear adjacent to this gear always come into contact in the same part every cycle, and the teeth in that part are worn out. . In general, this type of wear does not occur uniformly throughout each gear, but there are parts that wear well and parts that wear poorly, which causes uneven wear on each gear, and this causes the platen roller to wear unevenly. There are problems in that it causes uneven rotation and significantly shortens the life of each gear. From this, it can be said that setting all the reduction ratios between the gears constituting the reduction drive transmission mechanism to be integers deviates from the original design philosophy.

This invention was made to solve the above problems, and by reducing the uneven wear of each gear that makes up the deceleration drive transmission mechanism, it reduces uneven rotation of the platen roller caused by this uneven wear. It is an object of the present invention to provide a printer device capable of increasing the speed of gears and extending the life of each gear.

[Means for Solving the Problems] A printer device according to the present invention performs color recording by winding a recording paper around a platen roller and rotating it, and sequentially transferring a plurality of dyes one color at a time onto the recording paper. In a printer device equipped with a drive means for performing the above-described reduction drive transmission mechanism and a deceleration drive transmission mechanism that reduces the rotational speed of the drive means and transmits the reduced rotation speed to the platen roller, The present invention has a clutch mechanism that can change the speed reduction ratios between the gears to switch between a state in which all of the reduction ratios are integers and a state in which at least one of the reduction ratios is not an integer.

[Operation] In the printer device configured as described above, the reduction ratio between each gear is all integer during one color recording, and the reduction ratio between each gear is set only during paper feeding or paper ejection. By making at least one of the ratios non-integer, the relative meshing positional relationship between the gears in the next color recording is changed.

[Embodiment] FIG. 1 is an enlarged configuration diagram of main parts showing an embodiment of the present invention. In the figure, parts (1) to (9) are the same as or correspond to the above-mentioned conventional example, so the same reference numerals are given and the explanation will be omitted. (20) is a drive gear that is fixed to the motor shaft (8a), (21) is a platen gear that is fixed to the platen shaft (3a), (22)
is the platen roller (3) and the platen gear (21).
), and is a platen gear fixed to the platen shaft (3a). (23) is an intermediate gear rotatably supported around the gear shaft (9), which is always in mesh with the drive gear (20) and slides on the gear shaft (9) in the direction of arrow a. It can also be meshed with the platen gear (22).

(24) is an intermediate gear rotatably supported around the gear shaft (9);
) above in the direction of arrow a to remove the platen gear (21).
) can be interlocked. A rim (25) is rotatably supported around the gear shaft (9), and can slide on the gear shaft (9) in the direction of arrow a. Here, the intermediate gear (23)
(24) and the rim (25) rotate or slide integrally. (26) is a lever, which has a protruding portion (26a) and can rotate in the direction indicated by the arrow around the fulcrum shaft (26b), and one end is connected to the rim (25).
) is stuck. Reference numeral (27) denotes a lever, which is hooked on the protrusion (26a) and is moved in parallel in the direction of arrow C by a driving force (not shown).

The rim (25) and the lever (26) and (
27) constitutes a clutch mechanism, and the above lever (2
7) in the direction of arrow C, the lever (26) rotates in the direction of the arrow about the fulcrum shaft (26b), and the rim (25) and the intermediate gear (23) and ( 24) slide together on the gear shaft (9) in the direction of arrow a, and the intermediate gear (23)
and (24) said platen gears (21) and (2).
2), the intermediate gear (23) and the platen gear (22) are in mesh with each other, but the intermediate gear (24) and the platen gear (21) are not in mesh with each other; The intermediate gear (23) does not mesh with the platen gear (22>), but the intermediate gear (23) does not mesh with the platen gear (22).
24) and a state in which the platen gear (21) is meshed with each other.

The drive gear (20), the intermediate gear (23) and (
24) The modules of the platen gears (21) and (22) are all the same, and these five gears constitute a deceleration drive transmission mechanism. The number of teeth is, for example, the drive gear (
20), 88 intermediate gears (23), 59 intermediate gears (24), and platen gear (21).
Assuming that there are 118 pieces and 89 pieces of the platen gear (22), the number of the drive gear (20) and the intermediate gear (23) is 118 pieces.
) is 4, the reduction ratio between the intermediate gear (24) and the platen gear (21) is 2, which is an integer, and the reduction ratio between the intermediate gear (23) and the platen gear (22) is 2. becomes 89/88, which is no longer an integer.

The operation of the printer device configured as described above is shown in Figure 2~
This will be explained using FIG. However, the clutch mechanism shown in FIG. 1 is not shown in FIGS. 2 to 5.

First, the paper feeding state is shown in FIG. 2, where the intermediate gear (23) is engaged with the drive gear (20) and the platen gear (22), and the thermal head (5) and guide rollers (6) and (7) are engaged with each other. is separated from the platen roller (3), and when the clamp (2) is in the position shown in Fig. 2 on the platen roller (3), the recording paper (1) is conveyed in the direction of arrow d, and the clamp (2) moves in the direction of arrow e, and the leading edge of the recording paper (1) is clamped. Subsequently, the rotational force of the motor (8) is transmitted to the platen gear (22) via the drive gear (20) and the intermediate gear (23), and as a result, the platen roller (3) rotates in the direction of arrow f, and the recording paper When the tip of (1) reaches a predetermined recording start position near the thermal head (5), the motor (8) stops rotating, the platen roller (3) temporarily stops rotating, and a clutch mechanism (not shown) The intermediate gears (23) and (24) slide on the gear shaft (9) in the direction of arrow g, and the intermediate gears (24)
and the platen gear (21) mesh with each other. At this time, at a position facing the heating element (5a) of the ink sheet (4),
The recording start part of the first color yellow ink has arrived.
The thermal head (5) and guide rollers (6) and (7) move in the direction of the arrow, and the heating element (5a) is applied to the platen roller (3) via the ink sheet (4) and recording paper (1). Pressed. This state is shown in FIG. 3 as a recording start state.

Next, the platen roller (3) rotates in the direction of arrow i, and the recording paper (1) and ink sheet (4) are conveyed in the direction of arrow i while being in close contact with each other, and at the same time, the thermal head (5)
) is transmitted in synchronization with the conveyance speed of the recording paper (1), and the heating elements (5a) (not shown) are sequentially and selectively heated to spread yellow ink onto the recording paper (1). to record a yellow image. At this time, as the ink sheet (4) travels in the direction of arrow j, the sheet supply reel (4a) rotates in the direction of the arrow while applying appropriate pack tension, and the sheet take-up reel (4b) moves the ink sheet ( 4) Rotate in the direction of the arrow while winding up.

When the recording of the yellow image is completed through the above operations, the rotation of the platen roller (3) is temporarily stopped, and the thermal head (5) and guide rollers (6) and (7) (not shown) move in the direction of arrow m. and platen roller (3)
distance from. This state is shown in FIG. 4 as a recording end state.

After this, the platen roller (3) rotates in the direction of arrow n,
When the leading edge of the recording paper (1) again reaches the same position at which the yellow image recording started, the rotation of the platen roller (3) is temporarily stopped. During this time, the ink sheet (4) is conveyed for a certain period of time in the direction of arrow 0 by the sheet take-up reel (4b).
When the recording start portion of the second color magenta ink comes to a position facing the heating element (5a), the sheet take-up reel (4b) stops rotating. After the above operations in FIG. 4 are completed, the thermal head (5) and guide rollers (6) and (7) move in the direction of arrow p, and the heating element (5a) (1
) is pressed against the platen roller (3). Then, the platen roller (3) rotates and records a magenta image over the already recorded yellow image. When the recording of the magenta image is completed, a cyan image is similarly recorded in an overlapping manner to complete color recording. When color recording is completed, the intermediate gears (23) and (24) slide on the gear shaft (9) in the direction of arrow q by a clutch mechanism (not shown), and the intermediate gears (23) and (24) slide in the direction of arrow q on the gear shaft (9) in the same way as when feeding the paper. The platen gear (22) is engaged, and in this state, the platen roller (3) is rotated, the clamp (2) is moved at a predetermined position, the leading edge of the recording paper (1>) is released, and the paper is ejected. The state is shown in FIG. 5 as a paper discharge state.

[Effects of the Invention] This invention is configured as described above, and by changing the meshing combination between each gear only during paper feeding and paper ejection, the relative relationship between each gear in the next color recording is This changes the meshing positional relationship between gears, reduces uneven wear of each gear, reduces uneven rotation caused by this, and extends the life of each gear.

[Brief explanation of drawings]

FIG. 1 is an enlarged configuration diagram of main parts showing an embodiment of the present invention, FIG. 2 is a perspective view showing the paper feeding state in the operation of this embodiment, and FIG. 3 is a recording start state in the operation of this embodiment. FIG. 4 is a perspective view showing a recording end state in the operation of this embodiment, FIG. 5 is a perspective view showing a paper discharge state in the operation of this embodiment, and FIG. 6 shows a conventional printer device. 7 is a side view showing the paper feeding state in the operation of FIG. 6, FIG. 8 is a side view showing the recording start state in the operation of FIG. 6, and FIG. 9 is a side view of the recording state in the operation of FIG. 6. It is a side view which shows an end state. In the figure, (1) is recording paper, (2) is clamp, (3
) is the platen roller, <4) is the ink sheet, (5) is the thermal head, (6) and (7) are the guide rollers,
(8) is the motor, (9) is the gear shaft, (20) is the drive gear, (21) and (22) are the platen gears, (2
3) and (24) are intermediate gears, (25) is rim, (2
6) and (27) are levers. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] A driving means for performing color recording by wrapping a recording paper around a platen roller and rotating the recording paper, and sequentially transferring a plurality of dyes one color at a time onto the recording paper; In a printer device equipped with a deceleration drive transmission mechanism that transmits data to the deceleration drive transmission mechanism, the combination of meshing between the gears constituting the deceleration drive transmission mechanism is changed, and the reduction ratio between the gears is all an integer. A printer device comprising a clutch mechanism capable of switching between a state in which at least one of the ratios is not an integer.